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  1. #1
    Paul Hyndman's Avatar
    Paul Hyndman Guest

    Default Tweaking for Venus transit (a solar H-a Image)



    Hi All,

    I've been tweaking my solar H-a techniques in preparation for the Venus
    transit, though the weather here has not been obliging the collection of new
    test images. Here's a slightly different twist on the first light image
    gathered earlier this month (a single image taken with: AP Traveler,
    Coronado SolarMax 90, TeleVue 2X Powermate, SBG STL11000M, downsized approx
    60%)

    http://www.astro-nut.com/sun-disk04apr16.jpg

    The "hair" along the limbs had a muddier color in the previous version, so
    the LRGB basis for that portion (proms/spicules/corona) was shifted to
    increase the Red weighting, hopefully with a more natural looking transition
    (it's all theatrics, since the image is a colorized monochrome, but you get
    the point )

    A little atmospheric skitteriness due to the longish exposure time. A linear
    polarizing pair was used to knock down the signal enough so as to not
    saturate at the 0.01 second minimal exposure time. Matt L. (SBIG) has kindly
    rewritten the drivers to allow for a 0.001 second min exposure now
    (WooHoo!), hopefully eliminating the need for additional signal reduction.

    Yesterday's clear skies here would have allowed capturing another batch of
    test images, but for a prior commitment for an Astronomy Day for a show 'n
    tell (limited to visual observation). The session was a real hoot though,
    and the attendees seemed suitably impressed (two long filaments, a very
    prominent prominence, some plage, loads of hairy spicules and other visual
    goodies)

    Cheers,

    Paul

    --- http://www.astro-nut.com ---



  2. #2
    A.Gent's Avatar
    A.Gent Guest

    Default Tweaking for Venus transit (a solar H-a Image)


    "Paul Hyndman" <nospam@sbcglobal.net> wrote in message
    news:WNZic.12302$mP7.4140@newssvr31.news.prodigy.c om...

    Damn that's lovely!
    I'm keeping that image for when I get chilly.

    --
    Jeff R.



  3. #3
    Alistair Thomson's Avatar
    Alistair Thomson Guest

    Default Tweaking for Venus transit (a solar H-a Image)

    Hi

    What a fantastic image... Just make sure you post the picture of the transit
    when it happens - I can't wait to see it!

    Alistair
    http://www.geocities.com/the_150mm_reflector

    "Paul Hyndman" <nospam@sbcglobal.net> wrote in message
    news:WNZic.12302$mP7.4140@newssvr31.news.prodigy.c om...
    new
    approx
    transition
    get
    linear
    kindly



  4. #4
    Pete Lawrence's Avatar
    Pete Lawrence Guest

    Default Tweaking for Venus transit (a solar H-a Image)

    On Mon, 26 Apr 2004 01:42:14 GMT, "Paul Hyndman"
    <nospam@sbcglobal.net> wrote:


    As usual - totally stunning work. In fact that one is breathtaking!
    Well done Paul.

    --
    Pete Lawrence
    http://www.pbl33.co.uk
    Astronomy & digital astroimaging

 

 

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